added jenkinsfile

Jenkinsfile

+pipeline {
+  agent any
+
+  stages {
+    stage("Prepare") {
+      steps {
+        deleteDir()
+      }
+    }
+    stage("Checkout") {
+      steps {
+        git("https://git.unistra.fr/lamy/tache-simple")
+      }
+    }
+    stage("Build") {
+      steps {
+        sh("sleep 10")
+        sh("mkdir build")
+        sh("echo \"I'm done!\" > build/result.\$(date +%s)")
+      }
+    }
+    stage("Package") {
+      steps {
+        archive(includes: "build/*")
+      }
+    }
+  }
+
+  triggers {
+    pollSCM("* * * * *")
+  }
+}
+